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(No Model.)

N. H. ROBERTS.

BRAZING MACHINE. No. 369,077. Patented Aug. 30-l 1887.

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INVENTOR.

UNITED STATES PATENT OFFICE.

vNATHAN H. ROBERTS, OF INDIANAPOLIS, INDIANA.

BRAZING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 369,077l dated August 30, 1887.

Application filed May 31, 1887. Serial No. 230,753. (No model.)

To all whom, it may concern:

Be it known that I, NATHAN H. ROBERTS, of the city of Indianapolis, county of Marion, and State of Indiana, have invented certain new and useful Improvements in Brazing- Machines, of which the following is a specification.

My said invention consists in certain improvements upon that class of devices known as brazing-machines,77 whereby such a machine is rendered less expensive in construction and more easy to operate, all as will be hereinafter more particularly described and claimed.

Referring to the accompanying drawings, which are made a part hereof, and on which similar letters of reference indicate similar parts, Figure 1 is a top or plan view of abrazing-machine embodying my said invention; Fig. 2, an under side plan; Fig. 3, a transverse vertical section on the dotted line 3 3 in Fig. l; Fig. 4, a similar view on the dotted line 4 4; Fig. 5, a horizontal sectional view looking downwardly from the dotted line 5 5 in Fig. 3; and Fig. 6, a detail sectional View, on an enlarged scale, on the dotted line 6 6 in Fig. 3.

In said drawings the portions marked A represent the casting, which is the main frame of the machine; B, an overhanging portion carrying the upper screw-clamp; C, said screw-clamp; D, the lower screw-clamp; E, a series of cam-clamps for holding the saw in position, and F the brazing-bars.

The frame A is, generally speaking, of substantially the same formas in other machines for this purpose. It is, however, instead of being made solid, preferably a skeleton,which largely reduces the Weight and expense from that of the solid machines. The transverse portions of this frame A have notches a therein at intervals, in which may be placed keys a These form an adjustable rest for the back of the saw, so that the centerv of the saw can always be brought to the same position. With a Very wide saw these keys are removed and the saw comes against the ange which forms the back of the frame, and with saws of varying widths these keys are placed in the appropriate notches, all as will be readily understood.

The overhanging portion B is bolted firmly vand mounted on pivots e. `cams are so formed, as shown, that when the to the frame A and carries the screw C', on the lower end of whichis the bar of the clamp (l. Because of the adjustable feature, as beu fore described, there need be but one of these screws, as the saw, whatever its width, can be so arranged, by means of said adjustment, as to bring said screw in all cases opposite its center, and thus insure an even pressure with only the one screw. Said part B is recessed or has a projecting portion, b, by which the screw-clamp C is prevented from swinging with the screw while being tightened down, but when raised up said clamp is permitted to swing in the other direction, and thus move around out of the way of the operator in handling the saw.

The screw-clamps C and D are plain common clamp-bars, as shown, carried, respectively, by the screws C and D. The cam-clamps E are mounted in overhanging portions E', secured to the frame A. The front ends of said overhanging portions are preferably bifurcated and the clamps placed between them The faces of these handles are brought down they bear tightly against the upper surface of the saw and hold -it rmly onto the bed of the frame A. As will be readily understood, these cam-clamps are much more easily and quickly operated than screws, which have heretofore been used for the purpose. y

The brazing-bars F are of a well-known variety and need no special description.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a blazing-machine, the combination of the frame A, the overhanging portion B, the clamps-G and D, the single screws for operating said clamps, and adjustable stops a', arranged in said frame A,whereby the saw-blade may be so adjusted and held in proper position between said clamps that said single set of screws maybe sufficient to operate them,

4 substantially as set forth.

2. The combination, in a blazing-machine, of the frame A, provided with a series of notches, a, adjustable stops a', mounted in said notches, the clamps C and D, a single set of screws for operating said clamps, and a series of cam-clamps, E, arranged on each side ICO of seid screw-clamps for holding the ends of from swinging, except in one direction, said the sawblade, all substantially as set forth. clamp, and the Single screw for operating the 3. The combination, in :L brazinginaehine, same, Substantially as set forth. ofthe open or skeleton i'rnnie A, the clamps In witness whereof I have hereunto set my I5 C and D, mounted thereon, and a stop for said hand and seal, at Indianapolis, Indiana., this clamp G, by which it is prevented from swing- 26th day of May, A. D. 1887.

ing with the screw which euri-ies it7 except in N ALTRAN H ROBERTS In presence ofone direction.

4. The combination of the frame A, the

C. BRADFORD, CHARLES L. THURBER.

overhanging arm B, carrying the screw-clam p and formed with a Stop to prevent Said'olmnp 

